Jennifer Aniston's big fat Greek wedding!

The star’s family confirms she and Justin will tie the knot this year, on Crete.

She’s kept the showbiz world guessing for months, but finally, multiple sources confirm Jennifer Aniston will marry boyfriend Justin Theroux in Greece this year. The nuptials will take place in Chania, a picturesque seaside town on the island of Crete, where Jen’s father, Days Of Our Lives actor John Aniston, was born.

“It’s very exciting,” says her cousin Antonis Anastassakis, who is helping Jen’s personal assistant plan the wedding. “All of the family is waiting for her to come back to Greece.” Antonis tells Woman’s Day that the event will be a huge affair, with hundreds of guests expected to attend. “We are a very large family,” he says. “We’re already preparing for the wedding celebration. We will have a blast, for sure. I want Jen to have a good time with her husband.”

The guest list is heavy on celebrities, adds an insider, with Jen’s girlfriends Sheryl Crow, Courteney Cox, Laura Dern and Chelsea Handler all expected to attend. Courteney’s daughter Coco will be the flower girl. Jen’s Just Go With It co-stars Nicole Kidman and Adam Sandler are also set to receive invites, as will Jake Gyllenhaal, and Tom Hanks and his wife Rita Wilson, who Jen had dinner with earlier this month.

“Jennifer feels Crete is the ideal setting for her nuptials,” another close source tells US magazine National Enquirer. “Her father always made sure that she appreciated her Greek roots.” Jen herself has spoken at length about her heritage, saying, “I lived there for a year when I was five and six. My family had a beautiful farm. It would be a refreshing thing to be out of this [Hollywood] bubble.”

Read more about Jen's wedding plans in this week’s Woman’s Day on sale Monday April 16, 2012.